Organic compounds

Aliphatic compounds
Aliphatic compounds are organic molecules that do not contain aromatic systems. ....
Hydrocarbons - Alkanes- Alkenes - Diene or Alkadienes - Alkynes - Halogenoalkanes
Aromatic compounds
Aromatic compounds are organic molecules that contain one or more aromatic ring system.
Benzene - Toluene - Styrene- Xylene- Aniline - Phenol - Acetophenone - Benzonitrile - Halogenoarenes -Naphthalene- Anthracene- Phenanthrene- Benzopyrene - Coronene- Azulene - Biphenyl
Heterocyclic compounds
Heterocyclic compounds are cyclic organic molecules whose ring(s) contain at least one heteroatom. These heteroaoms can include oxygen, nitrogen, phosphorous, and sulfur.
Pyridine - Pyrrole- Thiophene - Furan
Functional groups
Alcohols - Mercaptans - Ethers - Aldehydes- Ketones- Carboxylic acids - Esters - Carbohydrates -Alicyclic compounds - Amides- Amines - Lipids - Nitriles
Polymers
Polymers are a special kind of molecule. Generally considered "large" molecules, polymers get their reputation regarding size because they are molecules that consist of multiple smaller segments. The segments could be chemically identical, which would make such a molecule a homopolymer. Or the segments could be vary in chemical structure, which would make that molecule a heteropolymer. Polymers are a subset of "macromolecules" which is just a classification for all molecules that are considered large.
Polymers can be organic or inorganic. Commonly-encountered polymers are usually organic (e.g.,polyethylene, polypropylene, Plexiglass, etc.). But inorganic polymers (e.g., silicone) are also familiar to everyday items.